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		<property:Applications rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Dans l'orchestre, les timbales fonctionnent selon ce principe. Les pédales dont elles sont munies permettent de tendre plus ou moins leur peau afin qu'elles produisent des sons plus aigus ou plus graves. (si il n'y a pas de pédale, tu peux régler la tension avec un système qui se vise).</property:Applications>
		<property:Complete rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Published</property:Complete>
		<property:Description rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Comment fonctionnent les timbales ?</property:Description>
		<property:Difficulty rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Easy</property:Difficulty>
		<property:Disciplines_scientifiques rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Acoustics</property:Disciplines_scientifiques>
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		<property:Explanations rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Par contact, la membrane fait vibrer l'air qui l'entoure, y compris à l’intérieur du cylindre. Le cylindre sert donc de caisse de résonance. Plus la membrane est tendue, plus elle revient rapidement dans sa position initiale : comme l'air vibre plus vite, le son produit est plus aigu.</property:Explanations>
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		<property:Main_Picture rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Timbales_VID_20200515_111359.mp4</property:Main_Picture>
		<property:Notes rdf:datatype="http://www.w3.org/2001/XMLSchema#string">[https://www.larousse.fr/dictionnaires/francais/timbale/78087 Définition Larrousse]</property:Notes>
		<property:Observations rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Quand tu frappes sur la membrane caoutchouteuse, tu joues avec son élasticité. Tu la mets en mouvement et donc tu la fais vibrer. Cette action produit un son. Plus la membrane est tendue, plus le son est aigu.</property:Observations>
		<property:Related rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Expériences du wikidébrouillards :

[[Sel qui danse]]

[[Accorder un verre]]

&lt;br/&gt;</property:Related>
		<property:Step_Content rdf:datatype="http://www.w3.org/2001/XMLSchema#string">- Une boite de conserve vide et propre

- Des gants de protection bien épais pour ne pas te couper avec les bords de la conserve

- Un ouvre-boîte

&lt;div class="icon-instructions caution-icon"&gt;
&lt;div class="icon-instructions-icon"&gt;&lt;i class="fa fa-exclamation-triangle"&gt;&lt;/i&gt;&lt;/div&gt;
&lt;div class="icon-instructions-text"&gt;Attention si tu forces trop tu peux déraper !&lt;/div&gt;
&lt;/div&gt;


- Un morceau de sac plastique ou un ballon de baudruche

- Une paire de ciseaux pour découper le sac

- Un elastique si tu utilise le sac plastique

&lt;br/&gt;</property:Step_Content>
		<property:Step_Content rdf:datatype="http://www.w3.org/2001/XMLSchema#string">- Découpe le fond de la conserve avec l'ouvre-boîte en prenant soin de mettre des gants et en ne forçant pas trop sur la conserve.

&lt;div class="icon-instructions idea-icon"&gt;
&lt;div class="icon-instructions-icon"&gt;&lt;i class="fa fa-lightbulb-o"&gt;&lt;/i&gt;&lt;/div&gt;
&lt;div class="icon-instructions-text"&gt;Tu peux demander de l'aide à un adulte.&lt;/div&gt;
&lt;/div&gt;


'''Au choix'''


- Découpe le ballon au niveau du cou

- Place la tête du ballon sur l'une des extrémité du cylindre


'''OU'''


- Découpe un morceau de plastique plus grand que l'ouverture de la conserve

- Bouche l'une des deux extrémités du cylindre avec ton morceau de plastique

- Fixe-le avec un élastique autour de la boite

&lt;br/&gt;</property:Step_Content>
		<property:Step_Content rdf:datatype="http://www.w3.org/2001/XMLSchema#string">- Tape sur la membrane en plastique. Que remarque-tu ?


- Essaie d'étirer la membrane de manière à se qu'elle soit plus tendue. Que constates-tu lorsque tu tapes à nouveau dessus ?</property:Step_Content>
		<property:Step_Title rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Réunir le matériel</property:Step_Title>
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		<property:Step_Title rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Réaliser l'expérience</property:Step_Title>
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